The word(s) "hour" appears 56 time(s) in 47 verse(s) in Quran in Abdullah Yusuf Ali translation.

(41) Therefore patiently persevere, as did (all) messengers of inflexible purpose; and be in no haste about the (Unbelievers). On the Day that they see the (Punishment) promised them, (it will be) as if they had not tarried more than an hour in a single day. (Thine but) to proclaim the Message: but shall any be destroyed except those who transgress?

(42) Do they then only wait for the hour,- that it should come on them of a sudden? But already have come some tokens thereof, and when it (actually) is on them, how can they benefit then by their admonition?

(43) And in the hour of early dawn, they (were found) praying for Forgiveness;

(44) The hour (of Judgment) is nigh, and the moon is cleft asunder.

(45) Nay, the hour (of Judgment) is the time promised them (for their full recompense): And that hour will be most grievous and most bitter.

(46) "Until there came to us (the hour) that is certain."

(47) They ask thee about the hour,-'When will be its appointed time?